Measurement and modeling of magnetostriction characteristics of highly Grain-oriented electrical steel sheet by using round-type two-dimensional single sheet tester
Issue title: 14th International Workshop on 1&2 Dimensional Magnetic Measurement and Testing (2016)
Guest editors: Zhiguang Cheng, Jianguo Zhu, Yongjian Li and Johannes Sievert
Affiliations: [a] College of Electrical and Computer Engineering, Chungbuk National University, Cheongju, Korea | [b] Power Systems Performance Unit, Hyosung Corporation, Changwon, Korea
Correspondence:
[*]
Corresponding author: Chang-Seop Koh, College of Electrical and Computer Engineering, Chungbuk National University, Chungsae-ro 1, Seowon-gu, Cheongju, Chungbuk 28644, Korea. Tel.: +82 43 210 2426; Fax: +82 43 274 2426; E-mail: kohcs@chungbuk.ac.kr.
Abstract: Magnetostriction in highly Grain-oriented electrical steel sheet (ESS) is a primary source of vibration and acoustic noise of power transformers at no-load condition. Especially rotating magnetization, as it occurs in joint area of three-phase power transformer, makes the magnetostriction bigger and more complex than that under alternating magnetization. Meanwhile, magnetic flux density along transverse direction makes a lot bigger magnetostriction than that under rolling direction. In this paper, a new measuring system of the magnetostriction are developed for a highly Grain-oriented electric steel sheet (HGO-ESS) of which magnetic domains are bigger in size and higher in degree of alignment than those of a Grain-oriented one. The magnetostriction characteristics of some HGO-ESS are measured by using the developed system under both alternating and rotating magnetic fields. An improved magnetostriction model is also proposed based on the mechanical elasticity, and its effectiveness is validated through comparisons with experimentally measured results from the measuring system.
